Hey guys, I have a 03 mazda6 and it's been misfiring pretty badly. My mechanic diagnosed it as a misfire on the 5th cylinder which needs the coil replaced and he also recommended a full tune up since it is high mileage. He quoted me $430 to do the work which sounds high. I asked him about it (honest guy) and he said that is is very labor intensive to get in there....so, for the mechanical guys, is a 2003 Mazda6 a difficult engine to service?

My car seems solid outside of this and I need to get the work done but just want to make sure the price is "within reason".